Calculates the difference between two dates in days, weeks, months, years, workdays and quarters. Plus a precise calendar breakdown 'X years Y months Z days'.
Calculating the difference between dates seems simple — but the result depends on which unit you use. The same interval is 730 days, 24 months, 2 years, or 104 weeks, and each formulation is correct.
This calculator shows the difference in all units at once — from days to quarters — and separately counts workdays and weekend days. Useful for planning, deadlines, contract durations, or just curiosity.
Days & weeks
Precise
730 days = 104 wk. + 2 days
Days are the most precise unit. A week is always 7 days, so conversion is unambiguous. Use days and weeks for short deadlines: sprints, delivery times, countdowns.
Months & years
Approximate
1 year 3 mo. 15 days
Months have different lengths (28–31 days), so converting to months is always approximate. The tool counts full calendar months. Useful for age, contract duration, employment tenure.
Workdays
Mon–Fri
14 cal. days = 10 workdays
Workdays are Monday–Friday, excluding public holidays. Holidays vary by country and are not counted. Use for estimating task completion timelines.
Quarters
For business
6 months = 2 quarters
A quarter is 3 months. Used in financial planning, reporting and business analytics. A quarter doesn't depend on specific month lengths — it's simply one fourth of a year.
04
Frequently asked questions
Enter both dates and the answer appears at once in days, weeks, months, quarters and years, plus an exact breakdown such as «2 years 3 months 5 days». Leap years and unequal month lengths are handled, so there is nothing left to adjust by hand afterwards.
Put today as the start and the event as the end. The result is shown in several units at once, which matters when the date is far off: «412 days» is harder to picture than «1 year, 1 month and 16 days», even though the two are the same span.
Start with the birth date, end with today, and read the exact breakdown. Age counts completed years and increments on the birthday itself — not by dividing elapsed days by 365, an approximation that drifts by nearly ten days by the time someone turns forty.
There is nothing to switch on: working days and weekend days are always calculated and shown as separate rows. Saturday and Sunday count as the weekend. A separate row breaks the span down by weekday — how many Mondays, Fridays and the rest it contains. Public holidays and moved days are not included — the calendar differs by country and is reissued every year.
Because months are not the same length. From 31 January to 28 February is both «one month» and «28 days», and each answer is right in its own logic. The page therefore shows both at once — the calendar difference in months and the exact day count — and the task decides which one you need.
No. The calculation runs in your browser and the dates are neither transmitted nor stored. That is worth knowing when the span you are measuring is a contract term or somebody's age: neither leaves the tab. Only the name of the opened tool is sent, for a popularity counter.